Two rock climbers in possession of a large stolen diamond are killed, and Don and the team hunt for the murderers; Charlie considers whether he should have his FBI clearance reinstated.

The team investigates an increase in ATM kidnappings when a woman who was abducted and forced to withdraw money is murdered; Charlie meets the investigator who will decide the fate of his FBI security clearance.

When eight people, including two police officers, are gunned down in a coffee shop, Don and his team uncover a trail of blackmail, corruption and romance; McGowan expands his investigation of Charlie and Don.

Don's team helps Agent Bloom, a veteran with the FBI, track down a con man who has eluded Bloom for years. Meanwhile, the final decision on Charlie's clearance is handed down, and it doesn't just affect Charlie. Don's job is on the line as well.

The team investigates a crew stealing high-end goods from a shipping service; Don questions his faith in the FBI when one of his men is killed on duty.

One of Don and Charlie's friends dies in what is deemed an accident. Not convinced, the brothers investigate further and uncover something shocking.

When a passenger train collides with a freight train David (Alimi Ballard), Don, and Colby are called in to help rescue survivors and to investigate the cause of the crash

The team sifts through various rumors about a controversial charity organization to find the guilty party after its office building is bombed.

Charlie is forced to turn to his arch rival for help when a vigilante group goes after a career criminal.

Don turns to his newly found religious beliefs when he is forced to deal with an escaped criminal who is bent on seeking revenge.

Don and his team must race to save the hostages being held on a hijacked bus.

A feud between Chinese gangs leads to the kidnapping of an undercover agent and the reappearance of Samuel Kraft.

The team searches for a pair of limited edition sneakers after they are stolen from a foreign ambassador.

When a case against a weapons smuggler falls apart, the team takes a closer look at the jury that heard the case, searching for signs of jury tampering.

Charlie puts together a plan to stop a dangerous drug from hitting the streets of LA. Will his plan work? Or will it cost the life of one of Don's agents?

The team's number one suspect in the death of a scientist is a super computer.

The team gets a last minute tip that could exonerate a dangerous mob boss who is about to be executed; Charlie tries to help the CalSci basketball team break their losing streak.

The investigation into a professor's death takes a dangerous turn when the team finds their lead suspect has ties to a radical animal rights group.

Don's life hangs in the balance after he is injured during a raid while investigating a series of home invasions.

Feeling guilty over the stabbing, Charlie puts his attention on finding a serial killer using math theories to help the team solve the case before another life is taken.

Don and the team are sent to look into a series of bank robberies and soon name former FBI Agent Roger Bloom as their lead suspect.

When Amita is abducted, Don and the team’s frantic search for her leads them to the delusional head of a cult, but it is up to a distraught Charlie to discover what the suspect’s bizarre plans for her are.